NextSyncCommittee: StorageDescriptor<[], {
    aggregate_pubkey: {
        x: {
            x: FixedSizeArray<14, number>;
            xes: number;
        };
        y: {
            x: FixedSizeArray<14, number>;
            xes: number;
        };
        z: {
            x: FixedSizeArray<14, number>;
            xes: number;
        };
    };
    pubkeys: FixedSizeArray<512, {
        x: {
            x: FixedSizeArray<14, number>;
            xes: number;
        };
        y: {
            x: FixedSizeArray<14, number>;
            xes: number;
        };
        z: {
            x: FixedSizeArray<14, number>;
            xes: number;
        };
    }>;
    root: FixedSizeBinary<32>;
}, false>

Sync committee for next period